MAX787 Datasheet, PDF (1/4 Pages) Maxim Integrated Products – 5V/3.3V/3V 5A Step-Down, PWM, Switch-Mode DC-DC Regulators

19-0182; Rev 3; 9/95
5V/3.3V/3V 5A Step-Down, PWM,
Switch-Mode DC-DC Regulators
_______________General Description
The MAX787/MAX788/MAX789 are monolithic, bipolar,
pulse-width modulation (PWM), switch-mode, step-down
DC-DC regulators. Each is rated at 5A. Very few external
components are needed for standard operation because
the power switch, oscillator, feedback, and control circuitry
are all on-chip. Employing a classic buck topology, these
regulators perform high-current step-down functions.
The MAX787/MAX788/MAX789 have excellent dynamic
and transient response characteristics, while featuring
cycle-by-cycle current limiting to protect against overcurrent
faults and short-circuit output faults. They also have a wide
8V to 40V input range.
Each regulator is available in a 5-pin TO-220 package.
These devices have a preset 100kHz oscillator frequency
and a preset current limit of 6.5A. See the MAX724/
MAX726 data sheet for more applications information.
_______________________Applications
Distributed Power from High-Voltage Buses
High-Current, High-Voltage Step-Down
Multiple-Output Buck Converter
__________Typical Operating Circuit
INPUT
8V TO 40V
220µF
VIN
VSW
MAX787
VC
SENSE
2.7k
GND
0.01µF
50µH
OUTPUT
5V AT 5A
MBR745
470µF
___________________________Features
o Input Range: Up to 40V
o 5A On-Chip Power Switch
o Fixed Outputs: 5V (MAX787)
3.3V (MAX788)
3V (MAX789)
o 100kHz Switching Frequency
o Excellent Dynamic Characteristics
o Few External Components
o 8.5mA Quiescent Current
o TO-220 Package
______________Ordering Information
PART
MAX787CCK
MAX787ECK
MAX788CCK
MAX788ECK
MAX789CCK
MAX789ECK
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
5 TO-220
5 TO-220
5 TO-220
5 TO-220
5 TO-220
5 TO-220
___________Product Selection Guide
PART
MAX724
MAX726
MAX727
MAX728
MAX729
MAX787
MAX788
MAX789
VOUT (V)
Adjustable
Adjustable
5
3.3
3
5
3.3
3
IOUT MAX (A)
5
2
2
2
2
5
5
5
__________________Pin Configuration
FRONT VIEW
5
MAX787
MAX788
4
MAX789 ³
2
1
VIN
VSW
GND
VC
SENSE
STEP-DOWN CONVERTER
5-PIN TO-220
CASE IS CONNECTED TO GROUND. STANDARD PACKAGE HAS STAGGERED LEADS.
CONTACT FACTORY FOR STRAIGHT LEADS.
________________________________________________________________ Maxim Integrated Products 1
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